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Atomic structure

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Question 2

Antimony is an element in Group 5 of the Periodic Table.

A sample of antimony contains two isotopes, 51121Sb^{121}_{51}\text{Sb}51121​Sb and 51123Sb^{123}_{51}\text{Sb}51123​Sb.

a.

State how the nuclei of the two isotopes are similar.

[1]
b.

State how the nuclei of the two isotopes are different.

[1]
c.

How many electrons are in the outer shell of an antimony atom?

  • A: 5
  • B: 51
  • C: 70
  • D: 121
[1]
d.

The relative abundances of the two isotopes in the sample of antimony are:

  • 51121Sb^{121}_{51}\text{Sb}51121​Sb: 57.3%57.3\%57.3%
  • 51123Sb^{123}_{51}\text{Sb}51123​Sb: 42.7%42.7\%42.7%

Calculate the relative atomic mass of antimony. Give your answer to one decimal place.

[3]

Atomic structure Questions

  1. IGCSE
  2. /Chemistry
  3. /Atomic structure